Ozone days (number)
Ohio - Summit

County

State

National

HP 2020

Annual number of days with daily 8-hour maximum ozone concentration over the National Ambient Air Quality Standard

Numerator

The number of days per year that air quality in a county was over the National Ambient Air Quality Stated for ozone

2008 - Dimensions

Total

County Value: 7Standard Error:0

Comparison of 67 Counties

7

Low: 1High: 13

Historical Data

Dimension

2008

2007

2006

2005

2004

2003

2002

2001

Total

7

22

5

21

5

9

34

18

DSU - Data statistically unreliable.

Methodology

Air Quality Standard monitoring data were used for counties and days with monitors and hierarchical Bayesian data were used for any county or day without monitors. The spatial resolution of the HB grid cell used is 36 Km. The grid cell values were transferred to counties based on a population weighted approach. The indicators are available for counties/states in the conterminous US (Lower 48 + Washington DC). HB modeled data are not available for AK and HI.

Data Source(s)

Public Health Air Surveillance Evaluation Project Team (PHASE)

Description
Because of the problems inherent in measuring air quality, particularly the lack of air quality monitors, the Public Health Air Surveillance Evaluation project team developed an innovative strategy to model air quality. Researchers used the model output to estimate peak fine particulate matter and ozone concentrations for each day in the year and, using National Ambient Air Quality Standards, estimate the number of days that the air quality was poor for sensitive populations due to these contaminants.

MethodologyThe Environmental Protection Agency's (EPA) first step to address insufficient data collection sites was the creation of an air quality simulation model, the Community Multi-Scale Air Quality Model (CMAQ). To improve upon CMAQ, the PHASE project uses both CMAQ output and monitor data in a hierarchical spatial-temporal model to estimate daily ozone and fine particulate matter concentrations throughout the year